CN202772656U

CN202772656U - Standby power supply online device

Info

Publication number: CN202772656U
Application number: CN 201220334472
Authority: CN
Inventors: 唐寅生; 张传青; 唐宗华; 王�琦
Original assignee: BEIJING GUONENGZIJIN ELECTRICAL TECHNOCLOGY CO LTD
Current assignee: Beijing Husu Electric Co., Ltd.
Priority date: 2012-07-11
Filing date: 2012-07-11
Publication date: 2013-03-06
Anticipated expiration: 2022-07-11

Abstract

The utility model relates to a standby power supply online device. The standby power supply online device includes two voltage source converters as well as a direct current short bus and a direct current capacitor which are connected between the two voltage source converters, wherein each voltage source converter includes a converter transformer, a converter reactor, a voltage source converter valve and a controller of the voltage source converter. The standby power supply online device of the utility model can not only isolate the penetration of a short-circuit fault between a working power supply and a standby power supply and realize an online operation mode of the standby power supply at the same time; the standby power supply online device can realize power exchange between the working power supply and the standby power supply and realize a continuous power supplying function in the process of switching the working power supply and the standby power supply of a user; and therefore, the standby power supply online device is advantageous in effectively improved power supply voltage quality, increased satisfaction of the user in the voltage quality, and functions such as improving the power factor of the bus, improving the voltage waveform of the bus, stabilizing the voltage and inhibiting temporary voltage drop of the bus.

Description

The stand-by power supply on-line equipment

Technical field

The utility model relates to a kind of stand-by power supply on-line equipment, particularly relates to a kind of stand-by power supply on-line equipment for power plant, transformer station and other users.

Background technology

Automatic throw-in equipment of emergency power supply refers to that working power hinders after the disconnection for some reason, and Backup Power Switch can automatically and promptly be closed and be devoted oneself to work, and user power utilization is switched to stand-by power supply power supply, a kind of automatics that makes the user be unlikely to have a power failure.

At present, existing automatic throw-in equipment of emergency power supply includes a Backup Power Switch and monitor controller thereof, the dynamic and static contact of Backup Power Switch is connected across respectively between working power and the stand-by power supply, when its monitoring system detects the tripping of working power switch, the working power decompression, and when stand-by power supply had voltage, its controller Backup Power Switch of closing immediately restored electricity.

But, to find in practice, existing standby power supply device has the following disadvantages: Backup Power Switch is mechanical switch, do not accomplish on-line operation, be the time of user's interruption of power supply in the Switching power process at least more than the second level, reduced the power supply quality of power supply, affected user's production.

This shows, above-mentioned existing standby power supply device obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.How to found a kind of device, the short trouble that both can isolate between working power and the stand-by power supply when fault passes through, can under normal mode, realize again the use in parallel of stand-by power supply and working power, a kind of new stand-by power supply on-line equipment of the flexible control of interconnected power between stand-by power supply and the working power, the current industry utmost point of real genus needs improved target.

The utility model content

The technical problems to be solved in the utility model provides a kind of stand-by power supply on-line equipment, its short trouble that both can isolate between working power and the stand-by power supply when fault is passed through, can realize again the on-line operation mode of stand-by power supply under the normal mode, thereby overcome the deficiency of existing standby power supply device.

For solving the problems of the technologies described above, a kind of stand-by power supply on-line equipment of the utility model, comprise two voltage source converters and be connected to two direct currents between the voltage source converter and adopt circuit and direct current capacitor, wherein: voltage source converter comprises converter transformer, converter reactor, voltage source converter valve and controller thereof.

As a kind of improvement of the present utility model, the brachium pontis of described voltage source converter valve is made of the controlled shutoff device of power.

The brachium pontis of described voltage source converter valve is made of IGBT, IGCT and anti-paralleled diode.

Described two voltage source converters all are circumscribed with isolation switch.

After adopting such design, the short trouble that the utility model had both both been isolated between working power and the stand-by power supply when fault passes through, realized simultaneously again stand-by power supply on-line operation mode, power interchange between can realizing again between stand-by power supply and the working power, the flexible control of power, the handoff procedure continued power function of stand-by power supply and working power, effectively raise the supply power voltage quality, increased the satisfaction of user to quality of voltage, in addition, also has the bus of improvement power factor, improve the busbar voltage waveform, stablize the functions such as busbar voltage and inhibition voltage dip.

Description of drawings

Above-mentioned only is the general introduction of technical solutions of the utility model, and for can clearer understanding technological means of the present utility model, the utility model is described in further detail below in conjunction with accompanying drawing and embodiment.

Fig. 1 is composition and the scheme of installation of the utility model stand-by power supply on-line equipment.

Fig. 2 is the partial circuit schematic diagram of the utility model stand-by power supply on-line equipment.

Embodiment

See also shown in Figure 1, the utility model stand-by power supply on-line equipment, comprise two

voltage source converters

2,3 and the direct current that is connected between two

voltage source converters

2,3 adopt circuit and direct current capacitor 4, together with its

controller

5,6 and the device such as cooling, be installed in the valve Room.

Wherein,

voltage source converter

2,3 comprises converter transformer, converter reactor, voltage source converter valve and controller thereof.The brachium pontis of voltage source converter valve by the controlled shutoff device of power, consists of such as IGBT, IGCT and anti-paralleled diode.

Please cooperate and consult shown in Figure 2ly, the voltage source converter valve adopts the three-phase bridge connection, the direct current side joint direct current capacitor 4 of three-phase bridge, and the interchange side joint converter reactor of three-phase bridge, and then receive on the ac bus by converter transformer and isolation switch.

For adapting to the requirement of electric current and voltage grade, can with the element of the voltage source converter valve portion in the

voltage source converter

2,3, be connected in series or parallel such as IGBT, IGCT etc.; To reach the requirement that adapts to relevant voltage or current class.

As shown in the figure, AC power 1 is powered to load 1 and load 2 respectively from exchanging bus 1 and ac bus 2 with AC power 2 each warp, and the utility model stand-by power supply on-line equipment substitutes existing mechanical switch, be connected across between ac bus 1 and the ac bus 2 by isolation switch, for subsequent use each other.

AC power 1 is interconnected with AC power 2, can be synchronously interconnected or asynchronous interconnected; Can be non-electromagnetic looped network closed loop or the electromagnetic looped network closed loop in the same electrical network, the group of transformer can be identical or different, by power direction and the size of the utility model device, can set on demand.

Under the normal operating mode, load 1 and load 2 respectively by AC power 1 and AC power 2 as the working power power supply, be connected across stand-by power supply on-line equipment between ac bus 1 and the ac bus 2 online with two AC power parallel operations, as stand-by power supply.

AC power 1 breaks down when stopping transport, and isolation switch closes a floodgate immediately, and AC power 2 is connected with voltage source converter 3 through ac bus 2; Obtain stable alternating-current voltage source through converter transformer, converter reactor; The voltage source converter valve according to the connection of a definite sequence and the shutoff horizontal pulse width modulated of going forward side by side, converts DC power supply to through direct current capacitor 4 under the effect of its controller 6; DC power supply accesses again the voltage source circulation valve of voltage source converter 2, according to the connection of a definite sequence and the shutoff horizontal pulse width modulated of going forward side by side, is reverse into AC power under the effect of its controller 5; Through converter reactor, converter transformer and bus, interconnected side by side with AC power 1 again, as the stand-by power supply of load 1, realized the stand-by power supply on-line operation.Vice versa.

The utility model has been isolated outside the short trouble between work and the stand-by power supply, overcome the mechanical switch deficiency that the user has a power failure in short-term in handoff procedure, realize loading on continued power in the electrical source exchange process, effectively raised quality of voltage, increased the user to the satisfaction of quality of voltage.

The above; it only is preferred embodiment of the present utility model; be not that the utility model is done any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in the protection range of the present utility model.

Claims

1. a stand-by power supply on-line equipment is characterized in that comprising two voltage source converters and is connected to two direct current sample circuit and direct current capacitors between the voltage source converter, wherein:

Voltage source converter comprises converter transformer, converter reactor, voltage source converter valve and controller thereof.

2. stand-by power supply on-line equipment according to claim 1 is characterized in that the brachium pontis of described voltage source converter valve is made of the controlled shutoff device of power.

3. stand-by power supply on-line equipment according to claim 1 is characterized in that the brachium pontis of described voltage source converter valve is made of IGBT, IGCT and anti-paralleled diode.

4. each described stand-by power supply on-line equipment according to claim 1-3 is characterized in that described two voltage source converters all are circumscribed with isolation switch.